Improvement in devices for grinding rotary cutters



J. J. GRANT.

Improvement in Devices for Grinding Rotary-Cutters.

No.129,548. Patentedluly 16,1872.

Ja -z UNITED STATES PATENT 'QFFICE.

JOHN J. GRANT, OF GREENFIELD, MASSACHUSETTS.

IMPROVEMENT IN DEVICES FOR GRINDING ROTARY CUTTER S.

Specification forming part of Letters Patent No. 129,548, dated July 16, 1872.

To allwhom it may concern:

Be it known that 1, JOHN J. GRANT, of Greenfield, in the county of Franklin and State of Massachusetts, have invented a new and useful Improvement in Devices for Grindin g the Knives of Rotary Planing-Machines and other Gutters, of which the following is a full, clear, and exact description, reference bein g had to the accompanying drawing forming part of this specification, in which- Figure 1 represents a front view of my improved grinding device as applied to the knifecylinder of aplaning-machine; Fig. 2, atransverse section of the same taken as indicated by the line as w; and Fig. 3, a plan thereof.

4 Similar letters of reference indicate corresponding parts.

My invention relates to a rotary grindingwheel having a crosswise action on the edge of the knife to be ground, and also made capable of longitudinal travel in direction of the length of the knife without necessitating the removal of the knives from the planer or other tool. The invention consists in novel means for attaching the grinding device to the machine the cutters of which it is designed to operate upon, whereby said device may be applied to. the machine without any special construction of the latter or drilling of it to make the attachment, asby bolts and brackets, and whereby facility is afforded for adjustment and attachment of the device to different sized machines or lengths of cutter-shafts. The invention, like-- wise, includes a novel adjustable attachment or mode of supporting the grindingwheel, whereby facility is afforded for grinding with a straight or more or less hollow bevel by varying the position of said wheel, so that it is made to occupy either a straight or more or less oblique position relatively in a transverse direction to the edge of the knife.

Referring to the accompanying drawing, A represents the cutter-shaft of a rotary planingmachine, and B the cylinder of knives or cutters b secured thereon. G is the frame of the grinding device, consisting of a bar with arms frame, and is provided with a center-pin, d, that is made capable of being slid longitudinally by a nut,'f, arranged to fit .a screwthread on said pm, which pin is prevented from turning by a feather fit of it through the eye of the arm or bracket. By these. means the grinding device is made capable of attachment, by the center-pins d d, to the cuttershaft A in a true position relatively with its center, and is made capable of adjustment to suit different-sized machines and lengths of cutter-shaft. The frame 0 maybe supported or stayed to hold it to its place by a bracket, or in any suitable manner; but no bracketed connection of said frame is required with the frame of the planer, so that the grinding device may be attached and detached with facility and dispatch without reference to the frame of the planing-machine. D is the revolving emery or other grinding wheel that may be driven by a pulley, g, from a counter-shaft or in any other suitable manner. The arbor of this wheel works in bearings mounted on a plate or.rin g, E,which is made capable of adjustment around an axis or center intersecting the wheel transversely, said ring working in or on a table, 13, and locked at its adjustment therein or on by screws h. This mode of supporting the grinding-wheel allows of its being turned either'to lie at right angles to the knife under operatio n'mr obliquely theretohtccording to the more or less hollow or straight bevel it is required to give to the cutting-edge of the knife. The table F is carried by an upright slide, G, which is adjustable by a screw, z', up or down a box, H, that is free to slide along the bar of the frame 0, and may be moved thereon either in a direct manner by hand or by a screw or other mechanical device connected with the box H. In this way provision is made for raising or loweringthe grinding-wheel and giving it travel in direction of the length of the knife.

In the operation of the grinding device, the cylinder B of the planer should be first turned or set so that the back of the knife will stand at its required level relatively to the grindin g-wheel and the proper adjustment made of the cylinder up to and across the grinder or latter relatively to the cylinder, when the operation of grinding may be efl'ected in a most its ends, the one of which is made adjustable in direction of the length of the frame, in combination with the center-pins d d, substantially as specified.

2. The arrangement of the upright slide G and cross or longitudinally sliding box H, the table F, and the turning plate E for carrying the grinding-wheel D, substantially as shown and described.

.JOHN J. GRANT.

Witnesses:

FRED. HAYNEs, J. W. Coomns. 

